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From: Peter Zijlstra <peterz@infradead.org>
To: Luca Abeni <luca.abeni@unitn.it>
Cc: Kirill Tkhai <tkhai@yandex.ru>, Juri Lelli <juri.lelli@arm.com>,
	Ingo Molnar <mingo@redhat.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"juri.lelli@gmail.com" <juri.lelli@gmail.com>
Subject: Re: Another SCHED_DEADLINE bug (with bisection and possible fix)
Date: Thu, 15 Jan 2015 13:23:23 +0100	[thread overview]
Message-ID: <20150115122323.GU23965@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <54B7A33F.20904@unitn.it>

On Thu, Jan 15, 2015 at 12:23:43PM +0100, Luca Abeni wrote:
> There are some parts of the patch that I do not understand (for example:
> if I understand well, if the task is not throttled you set dl_new to 1...
> And if it is throttled you change its current runtime and scheduling deadline...
> Why?)
> Anyway, I tested the patch and I confirm that it fixes the hang I originally
> reported.

I'll go look at the patch in a wee bit. But Juri, Luca, could you
describe the correct behaviour?

>From what I understand we should either modify the tasks run/sleep stats
when we change its parameters or we should schedule a delayed release of
the bandwidth delta (when it reaches its 0-lag point, if thats in the
future).

Doing neither will allow one to game the reservation system afaict.

  reply	other threads:[~2015-01-15 12:23 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-29 23:27 luca abeni
2015-01-04 22:51 ` Kirill Tkhai
2015-01-05 15:21   ` Luca Abeni
2015-01-05 23:07     ` Kirill Tkhai
2015-01-07  7:01       ` Luca Abeni
2015-01-07 12:29         ` Kirill Tkhai
2015-01-07 12:45           ` Luca Abeni
2015-01-07 13:04             ` Kirill Tkhai
2015-01-07 13:14               ` Luca Abeni
2015-01-09 11:15               ` Luca Abeni
2015-01-09 11:46                 ` Kirill Tkhai
2015-01-13  8:10           ` Juri Lelli
2015-01-13  9:26             ` Kirill Tkhai
2015-01-13 14:04               ` Peter Zijlstra
2015-01-14 12:43                 ` Kirill Tkhai
2015-01-15 11:23                   ` Luca Abeni
2015-01-15 12:23                     ` Peter Zijlstra [this message]
2015-01-15 13:35                       ` Luca Abeni
2015-01-28 14:08                         ` Peter Zijlstra
2015-01-28 14:40                           ` Luca Abeni
2015-01-30 10:25                           ` Luca Abeni
2015-01-30 10:35                           ` Juri Lelli
2015-01-31  9:56                             ` Peter Zijlstra
2015-02-02 11:31                               ` Juri Lelli
2015-02-02 13:57                               ` Luca Abeni
2015-02-04 14:34                           ` [tip:sched/core] sched/deadline: Fix deadline parameter modification handling tip-bot for Peter Zijlstra

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